the newest version is 2.6. i submitted the information.
note that there are now two different builds being maintained;
one for tiger:
http://home.nc.rr.com/jview/app/JView%202.6%20(Tiger).dmg.gz
and
one for leopard:
http://home.nc.rr.com/jview/app/JView%202.6%20(Leopard).dmg.gz

a surprisingly underrated/unknown little app. it flies through folders with thousands of images and opens high resolution images faster than preview (albeit with slightly less accurate color rendition and without anti alias). a simple, robust and fast replacement/expansion of preview's functionality.

Fast, simple and can browse different images within a folder with ease. It's really amazing that preview still can't do that. Compared to Xee for example I like the way windows are being placed: the top bar never changes its location.